BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Strange behaviour of Indy http          BorlandTalk.com Forum Index -> C++ Builder (Internet Socket) View previous topic :: View next topic   Author Message David Ayre Guest Posted: Tue Aug 01, 2006 3:52 pm    Post subject: Strange behaviour of Indy http Hi I am using Indy 9 with BDS2006 and have developed an http routine to do an automatic download of an update file from my website. Basically, it seemed to work fine until I replaced the update file on the website with a newer version. Now when I run my application, it downloads the file from the website, but when I look at it, it is the previous version. I'm sure the one on the website is the new one, but after downloading, I have the old one. Any ideas? David Back to top Bob Gonder Guest Posted: Tue Aug 01, 2006 6:50 pm    Post subject: Re: Strange behaviour of Indy http David Ayre wrote: Quote: Now when I run my application, it downloads the file from the website, but when I look at it, it is the previous version. I'm sure the one on the website is the new one, but after downloading, I have the old one. Any ideas? <Part A:Human error> First, make sure you uploaded the correct version. </Part A> <Part B: Program failures> Did you delete the old one before downloading the new one? Do you download to a different name, then swap new/old (and fail)? Did you actually download to the folder you thought you were sending it to? </Part B> <Part C:Web failures> Is your web site cached somewhere? Do you also update an html at the site, and does it show up properly with the user's browser going to your site? </Part C> Back to top David Ayre Guest Posted: Tue Aug 01, 2006 7:14 pm    Post subject: Re: Strange behaviour of Indy http Bob Gonder <notbg (AT) notmindspring (DOT) invalid> wrote: Quote: David Ayre wrote: Now when I run my application, it downloads the file from the website, but when I look at it, it is the previous version. I'm sure the one on the website is the new one, but after downloading, I have the old one. Any ideas? Part A:Human error First, make sure you uploaded the correct version. /Part A Yes. I checked this several times and if I download using ftp then it is correct. Quote: Part B: Program failures Did you delete the old one before downloading the new one? Do you download to a different name, then swap new/old (and fail)? Did you actually download to the folder you thought you were sending it to? I deleted the old file before uploading the new one. I am happy that the website holds the new file and that the webserver doesn't cash the files. Quote: /Part B Part C:Web failures Is your web site cached somewhere? Do you also update an html at the site, and does it show up properly with the user's browser going to your site? /Part C All I can think is that the Indy HTTP component is cashing the file somewhere and using the old one instead of downloading the new one, but I don't know how to overcome this. Cheers, David Back to top Remy Lebeau (TeamB) Guest Posted: Wed Aug 02, 2006 1:25 am    Post subject: Re: Strange behaviour of Indy http "David Ayre" <davidcayre (AT) ntlworld (DOT) com> wrote in message news:44cf61e0$1 (AT) newsgroups (DOT) borland.com... Quote: All I can think is that the Indy HTTP component is cashing the file somewhere TIdHTTP does not perform any kind of caching at all. It retrieves whatever the server provides. If you are receiving an old file, then the server itself (or a proxy in between) is performing caching on its end. There is nothing TIdHTTP can do to prevent that. What it can do, however, is request a non-cached version of the file, by setting the Request->Pragma property to "no-cache" before calling Get(). Gambit Back to top David Ayre Guest Posted: Wed Aug 02, 2006 1:19 pm    Post subject: Re: Strange behaviour of Indy http Quote: TIdHTTP does not perform any kind of caching at all. It retrieves whatever the server provides. If you are receiving an old file, then the server itself (or a proxy in between) is performing caching on its end. There is nothing TIdHTTP can do to prevent that. What it can do, however, is request a non-cached version of the file, by setting the Request->Pragma property to "no-cache" before calling Get(). Gambit Thanks Remy, but I have tried that and I still get the old version of the file. I inserted this line before the Get():- IdHTTP1->Request->Pragma = "no-cache"; I also tried inserting "no-cache" into the Request->Pragma slot in the object inspector for IdHTTP1 but all to no avail. I assume from this that I'll have to have a word with the website host. Thanks anyway, David Back to top Bob Gonder Guest Posted: Wed Aug 02, 2006 11:07 pm    Post subject: Re: Strange behaviour of Indy http David Ayre wrote: Quote: I deleted the old file before uploading the new one. Ok, but did you also delete the old file before downloading the new one with TIdHTTP? Back to top David Ayre Guest Posted: Thu Aug 03, 2006 1:14 pm    Post subject: Re: Strange behaviour of Indy http Bob Gonder <notbg (AT) notmindspring (DOT) invalid> wrote: Quote: David Ayre wrote: I deleted the old file before uploading the new one. Ok, but did you also delete the old file before downloading the new one with TIdHTTP? If you mean 'did I delete the old file from my computer before downloading the new one', the answer is yes. I do that in the application. Delete old file and then download new one, except that it is always the old one that appears. If I download the file using ftp, I get the new one. I have also tried Remy's suggestion of setting Request->Pragma = "no-cache"; But still it brings down the old file. I have asked the web host about this but am still waiting for a reply. Cheers, David Back to top David Ayre Guest Posted: Thu Aug 03, 2006 11:53 pm    Post subject: Re: Strange behaviour of Indy http "David Ayre" <davidcayre (AT) ntlworld (DOT) com> wrote: Quote: Bob Gonder <notbg (AT) notmindspring (DOT) invalid> wrote: David Ayre wrote: I deleted the old file before uploading the new one. Ok, but did you also delete the old file before downloading the new one with TIdHTTP? If you mean 'did I delete the old file from my computer before downloading the new one', the answer is yes. I do that in the application. Delete old file and then download new one, except that it is always the old one that appears. If I download the file using ftp, I get the new one. I have also tried Remy's suggestion of setting Request->Pragma = "no-cache"; But still it brings down the old file. I have asked the web host about this but am still waiting for a reply. Cheers, David I have since checked with the website host and there is no caching on the webserver. However, they suggest that the ISP might be caching files. If this is the case, it would seem that the Request->Pragma = "no-cache" doesn't work in this situation. I have also found that after a day, the new file is downloaded so the cache must be purged after a day. I suppose I can live with this, but it would be nice to be in control of the situation. 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